Dry cell.



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Pmuted June 15,1915.

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WITNESSES INVENTOR M RCU S A. Foos g ATTORNEY MARCUS A. roos, 0F FRnMoN'r, 01110,' Assreivon To NATIONAL CARBON coMPAivY, or

. CLEVELAND,1 IOHIO,.A CQRPORATION 4OF NEW JERSEY..

DRY entrN Applicatioxi filed December 2, 1912. Serial No. 734,477.

Be it known that I, MARCUS A. Foos, av citizen of the United States, residing at Fremont, in the county of Sandusky and Stateof Ohio, have invented a certain new and useful Improvement in Dry Cells, of whichV the following '1s a full, clear, and exact description. Myinvention-relat'es to -dr-y cells and one of the objects is to prevent the mix from falling between the lining and the container electrode.

Another object is 'to' thoroughly insulate the top of the can to prevent short circuits between the two electrodes. Other objects will appear in the appended description.

In the drawings: Figure l isa sectional'v view of a dry cell showingone way of constructing cells. Fig. 2 is a sectional view of a'zinc container with my improvement applied, the thickness df each layer being somewhat exaggerated for the vpurpose of illustration. Fig. 3-is a partial sectional viewl of a modification. Dry cells are constructed with bibulous linings betweemthezinc can or container to 1^ -serveas a reservoir for the electrolyte and tov prevent the mix from reaching the can. The mix must be thoroughly tamped inthe cell in order to reduce the internal resistance and to make, a solid, compact cell. In filling the mix and lthe subsequent tamping, the particles are liable to fall between the lining 35 and thecontainer. v This causes local action between the Zinc and theparticles, decreasing the life and'utility ofthe cell. The mix is also liableto. extend above the lining and cause a short circuit between the central electrode and the container electrode. '.To prevent both of these difficulties the lining 1 of the cell wasma'de 'long enough to extend above' the container 2 and turned over as at 3 so that the mix could beilled in and.

tamped with minimum chance of the par-l ticles falling between the lining and the container. After themix was thoroughly tamped around the electrode 4: the upper part of the lining was turned over the top of it as at 5. In bending the lining over the mix it is liable to become broken or torn, allowing the mix -to-reach the container. To avoid these diiculti'es I have devised schemesas shown in Figs. and 3.

has been previously wetted.

Referring to Fig. '2,@the container is provided at the top with p1tch, asphaltum or analogous insulating materlal which would ordinarily extend down abcut l inches from. the top. The coat may be applied with a brush or the can may be inverted and dipped into hot material the proper] depth. The latter process would also coat the outer part of the can, but this isy immaterial. l

an internal coat 6 of Othen ways for ap'- plying-the coat may be used. After the coat 1s applled the lining 1 and bottom 6 are Y placed in the can; -IThe lining is made i second coat 7 of pitch or analogous insulat- -ing material is applied on top of the first In Fig. 2 thesecond coat-7 is shown asl .shorter-'than the 'can as shown., but extendsabove Vthe lower edge of thecoating. The

overlapping the end ofthe liningbut this.'v

`may not always benecessary. In Fig. 3

the coat 7 is shown as abutting against the endoi", the lining and not extending over it.,

This would .prevent the mix from reaching "the container if itwere applied carefully so as to leave no, crevice .between the lining andthe coat. The lining is also liable vto be moved downward in the tamping process and for these reasons it is preferable to' apply the coat so that it extends past thev end othe" lining, particularly ifthe lining Itis preferable to apply two coats tothe cell `as described, but it: is not absolutely' necessary. -In some cases the coat 6 may be dispensed with.

My invention vtherefore provides means for eii'ectually preventing the mix from reaching the zinc can and eliminates the troubles caused bysuch defects in prior cells.

I-Iaving described my invention what I claim is:

l. In a dry cell, a container adapted to receive a mix, a bibulous lining therein and an adherent guard applied to the container and extending over thcend of the lining to prevent the min from reaching the container,

while it is being placed therein.

2. In al dry cell, a'container adapted to re-iA ceivea mix, a'. biliulous4 linin therein and a guard closel fitting the en of the lining to' preventt e mix from reaching the container while it is being placed inthe cell.- a; dry cell, s. container closed at-one 'end' adapted to receive a-mix, an insulating coating on the inside vofthe container at the open end, a bibulous Vlining overlapping the coating and avsecond coating overlapping the lining;

' 4. In a dry'cell, a Icontainer.closed at one end'adaptedto receive a mix, a coating of v pitch on theinside `of thel container at the open end, a -bibulous 'lining overlapping the coating and a second coating of pitch over- 2 0 lapping the lining.

5. The-steps in theprocessof making drycells which consist.: in placing the hibulous 'lining inthe container, applying an ad. herent insulating coating 4on the inside of 'one end of the container ing the mix therein.

'f 6. The process of making dry cells .which consists inplacing the bibulons lining within a; container, applying -an 'adherent in- 'sulatlng' coating tothe interior of the container and liningat the open end, and filling the mix therein.

7. The process of making dry cells .which andl lining, and ll consists in placing a bibulous linin withsignature. MARCUS A. roos.

. Witnesses:A

' W. Gr. Wam,

JOHN S. SMITH. 

